OK, my bottle of MX289 is near an end, time to report 
Dosages: 1 spray to 4 sprays
Self-Effects: Not any. Nada. Nowt. Nothing.
Effects on Others: Shiny happy people. I think.
MX289 is Instant Shine 4x with a new fixative to make it last longer. IS 1x I get instant self-effects from. Grinning like a lunatic for 5 minutes on 1 spray from a To Go. MX289 I get none of that…BUT…that doesn’t mean it’s not working. It could be that the fixative to make it last longer diminishes that rush and makes it last over a longer period. That’s how I look at it anyway.
With others I’m pretty sure I saw the shine effects but perhaps more subtle. i.e. people were shiny happy but not so pronounced. But it lasted for longer. A typical experience would be IS type effects 3 hours after application to top of head.
MX289 summary: less hard hitting than IS - seems to need longer exposure, but it is longer lasting. 4x IS in this new fixative isn’t like 4 sprays of 1x IS in normal fixative - to me, it’s more like 1x IS but lasting much much longer, and without the self-effects. Hope that makes sense!